What does cargo:VERSION do? #125
Description
@dtolnay help!
Can you please explain to me what cargo:VERSION does? You added this here:
f40afcc
In order to reverse-engineer this I've setup a crate library (version-printer) which uses a build.rs with:
fn main() {
println!("cargo:VERSION=999");
}
And in the main-crate I use:
use version_printer::version;
fn main() {
version();
for (key, value) in std::env::vars() {
// Filter out sensitive keys that might contain secrets
if key.contains("SECRET")
|| key.contains("KEY")
|| key.contains("TOKEN")
|| key.contains("PASSWORD")
|| key.contains("AUTH")
|| key.starts_with("REPLIT_")
{
println!("{}=<redacted>", key);
} else {
println!("'{}'='{}'", key, value);
}
}
}
Which shows that the version() function is actually called from the main.rs context so the library is properly used. BUT I don't see any environment variable exposed with VERSION or DEP_VERSION_SOMETHING and also I don't see any prints on the shell cargo build -vv. I've tried to pass invalid data like Strings instead of version numbers but it won't fail either.
I also studied the cargo source code but it is like searching for a needle in the hey stack as VERSION pops up pretty often.
So if you remember what your commit does please tell me.
fn main() {
println!(concat!("cargo:VERSION=", env!("CARGO_PKG_VERSION")));
}